Suggestions for SRB2,2D (and normal SRB2) easter egg ideas?

[SIG7Pro]

What easter eggs/refrences could be good for SRB2 and SRB2,2D (a project by me)?

(Yes mods, I have started it, have been working on it since early 2020, pics in this folder: SRB2,2D Screenshots

Have more pics but they aren't important)
These are just suggestions, devs can put anything they want.

 

[Tatsuru]

Your link requires logging into Google Drive. Find another image hosting service and link your pictures directly.

 

[SIG7Pro]

oh, gonna update

 

[sluggard]

can't open it

 

[SIG7Pro]

can't open it

I put the links to images and this is just meant to be about easter eggs

 

[clairebun]

You need to enable "sharing" in order for any of your Google Drive content to be visible to other people.

 

[SIG7Pro]

You need to enable "sharing" in order for any of your Google Drive content to be visible to other people.

now how am i supposed to do dat (edit: did)